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ASTM A229 Spring Steel vs. ACI-ASTM CT15C Steel

Both ASTM A229 spring steel and ACI-ASTM CT15C steel are iron alloys. They have 46% of their average alloy composition in common. There are 30 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is ASTM A229 spring steel and the bottom bar is ACI-ASTM CT15C steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 490 to 550
140
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 14
23
Fatigue Strength, MPa 710 to 790
130
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
76
Tensile Strength: Ultimate (UTS), MPa 1690 to 1890
500
Tensile Strength: Yield (Proof), MPa 1100 to 1230
190

Thermal Properties

Latent Heat of Fusion, J/g 250
310
Maximum Temperature: Mechanical, °C 400
1080
Melting Completion (Liquidus), °C 1450
1410
Melting Onset (Solidus), °C 1410
1360
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 50
12
Thermal Expansion, µm/m-K 12
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
1.7
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3
1.9

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
36
Density, g/cm3 7.8
8.0
Embodied Carbon, kg CO2/kg material 1.4
6.1
Embodied Energy, MJ/kg 19
88
Embodied Water, L/kg 46
190

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 200 to 230
90
Resilience: Unit (Modulus of Resilience), kJ/m3 3260 to 4080
93
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 60 to 67
17
Strength to Weight: Bending, points 40 to 43
17
Thermal Diffusivity, mm2/s 14
3.2
Thermal Shock Resistance, points 54 to 60
12

Alloy Composition

Carbon (C), % 0.55 to 0.85
0.050 to 0.15
Chromium (Cr), % 0
19 to 21
Iron (Fe), % 97.5 to 99
40.3 to 49.2
Manganese (Mn), % 0.3 to 1.2
0.15 to 1.5
Nickel (Ni), % 0
31 to 34
Niobium (Nb), % 0
0.5 to 1.5
Phosphorus (P), % 0 to 0.040
0 to 0.030
Silicon (Si), % 0.15 to 0.35
0.15 to 1.5
Sulfur (S), % 0 to 0.050
0 to 0.030